#@jargon@# A software change that is neither forward- nor backward-compatible, and which is costly to make and costly to reverse. E.g. "Can we install that without causing a flag day for all users?" This term has nothing to do with the use of the word flag to mean a variable that has two values. It came into use when a to convert from the old ASCII code to the new one; this was scheduled for Flag Day (a US holiday), June 14, 1966. (1998-01-15)
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